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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc876f98acc97730f7ed36c049d0364718dc65522822ae9a54ad836c7d892220' 
  AND token = 'p8ozTeEMHjkYFLmkUrE4ndJiRPiSdIrNGB7I/pUTgWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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