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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc8e307a6ed8e47d3a140354b9eafd121117cf73cc7bcba98f66447566b5a25a' 
  AND token = '/j9zgAH2a46vTMnA9XcNtHe/v9nuRCfLMl+U4Pb99/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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