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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90582a0b3a852b7e30a77034789ad5179b30d61d557a838746b16c58abdd5457' 
  AND token = 'xKXZuJ7uigMrwflGh4UUAA3CX62LUoRvvTnY7ayyvmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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