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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59c268026e88e0bdf22a48ba77e1cf1a6062112e4d09ce51a053dccee2b39384' 
  AND token = '0VaQP2HrTDMcPg4SVVjG77cCCfpdCsBFss0DQdEi1Xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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