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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc3a855d0b22cf0c6513b04b889350037e5f0da5a0f167b48bdd0655e2ea57bb' 
  AND token = '1aaeLj+eRpQ1/yJMQV7MnzkzEJil/cHTyjU1YzaLgH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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