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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b028d51f8600bfd6faed1ceb1af58181dc19333d668396eb0c8669d24fbb7f40' 
  AND token = 'WLu78apzmh/Y+QNh3XEFSN/XXEYO1VSSLc+SsUxk6EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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