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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74ba79c8836890c68218e50cbe5273b311e21a50d870c210a6e6b606b7681796' 
  AND token = 'O82JoDI0wZymLPm47NsAu37qVpX9RsbJoKAoaP6I/GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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