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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f986be9b2dc2b3f9e022021bdc3a67143d5d4c4c0ea2e4f1385193ea3077d69c' 
  AND token = 'kVVoYxMozCpMVmOqW43Vqva7NDkMEYiyGTRCHmHXWDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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