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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87e6fd3ddc76ff4ee6731bfdb660e6d2c6a8f66462f11fd45277642778d9c2cd' 
  AND token = 'LSVIbjEwprB7Asg0yi8GE5BCQkYfpZ1SPNXcxVi25OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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