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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee805ec2dc4ef8dbb8b54567a9ceefa23bcc13ac08c7bce29b63bddb6f2739c6' 
  AND token = 'aG3dhiuottDKf0mdMw3XCtzxMXbBIFgSJYScgpjB8jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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