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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f5df00712973d192b8dc214c9abd39e841906487ef2ba8d6b46e4c152d0b5a6' 
  AND token = 'vGW/r8ep95dqUyym5E3++rew6ivTLdIc2vDBC2dsKyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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