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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ba60b80a61a11ee9281e5d1c8c02653ad3cea3aeee07b17aeeefb1e4120caa9' 
  AND token = 'Gj3BOkA/Pd9/+GTcBWeaIDTM7Pl93sIAcEJf2Xhjcgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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