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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad528b83f1c2ec7f1f39fcd83a4dd441d81f3fde4dda56d01c77b87cd5a70305' 
  AND token = 'HNIVaw4Mhe2iNctnF7MxIlNBEh7f3Mo57wKmxE46FhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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