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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f1edae45db3705837858750253e0c4443de55700520ddedc4a304518d80ceef' 
  AND token = '0GTCLK/k0A8ItfieyPn+sft+9p9d/KGekwdNxlQgfVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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