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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be47ef86c84dc25f5b9e20d6e65165f07935e28f45a3c5e849b0763714473a44' 
  AND token = 'JektBja7i7fpWh4cYgPesDaVGxIlnQDc+NhyHh6gjOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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