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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2fa751ceb7279df2e285c4c18912763d69d5361795972bc0a942476e03c3ec39' 
  AND token = 'Os7XYzQqWIgyAnZ5RPptIofcqrs0Uk7uDxiQosnC5kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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