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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f22cff37d32b0aaba66882faa34e725121571414ef6827c720e7bcd5c303deb' 
  AND token = '8Y8OB/DFfeNfCX06sXSBFz9eq+Wcs/bRGfAtfr0WQeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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