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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55f2ba8e74b21a4dc79b8dca73202f8cad758a2187edcddaa5ec814f63c55764' 
  AND token = 'iMPm7E42XXL5gr3INCtIfqDp7q7rMHh6apoUP34p4kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}