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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8be702c93342d54594cbfdca63ccff0128cbad904518e67253ebc555ca222fb8' 
  AND token = 'a5HI+dR7ZaMKWLRQD3AA8aMRofIoINzabe9zmfOs/9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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