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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a282f1ac360f4e3f5e2e05369ab2b7ba786f0782630d558b4318592fc4563bab' 
  AND token = 'sGlX1Dk56PF3wGVS82TMchNdPoGMhaMABQOqEInnb1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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