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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a0cf357c3fb05501f4265e76f964f4059f2020c0397a07e9ab8d6a17ec0555c' 
  AND token = 'AodBejg3Kb3oYi3RvrwN63GQJzsD0F0N8RW3b5sJNkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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