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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ede92c68047ea12e7c805e53b166ab0453d4cebd373655da701faf30db092d63' 
  AND token = '2K45WwQ8i3TApNed3qQzui15Guq3//rB5En4oFlBe7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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