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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fc02d2f4534ff4051988e4bcf38fda3f1c326577ea764f431ce0c456d493c03' 
  AND token = 'MA2KFK46IfqRqq70InJJ1a0hiErie+DG2VVP7GSceuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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