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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f76f8446b6f119b7097e4e84b2977991454fa69fe2684f75577606c2393b6307' 
  AND token = 'g8h0o767eNA5JhCXKy/B9IwORL7U421+G7hGMxdO6mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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