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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c42cbf064264dedea662fb767b804257f0af2879ec1a92b44d9d2652c4ee3879' 
  AND token = '+Nn0roPMDqEo4Rnuc7iNB2sVEY4UZQK/zDfr0OqZuBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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