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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '936c20b6e61a1586780a32889c57a29f83bf100365b12ed56475541445ac3395' 
  AND token = '0xgCc0N5yq9RF6pyyWdwAUKGNccvqPiM2QnDcSIxu+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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