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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bdcc32298c7ce2f561d3ec0e49c05c0b9c5d4c4cbe826a5397ad8d6d557f2864' 
  AND token = 'j4BOVkrbDvC+zNUvyfm2xI/DZ5t3IrS4sKAz9a3tNzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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