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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a11637a99c8061010dff7a087a0af42efb7bb2a9314fb8b32112e1b6b031854' 
  AND token = '0y5i7u8G44NadscDyCjUtSbzimUylO1VPKVn0WT504s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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