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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03a6f01549596e25d1ee66f0e8e5c586c3a3e682105fc028d0f6310a3fe7ce4b' 
  AND token = 'fb8WHG/+Q21eo42H5v4IphuDXVeoxuflfvhNx1DdHeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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