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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e579dd27f81383021b8974288ee0956d21d19a3f143195bce1673ccecdc180e7' 
  AND token = 'H+JNpxhsxyPjFWt7CWWKkXmIGQV6Km0V5O2RBeomyM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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