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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd95c52cf1ba7eec21067a6196cd70fc25daf8201b285ddac7dc0684737927fd3' 
  AND token = 'cQVismzkump2wJOdEmyFWTE2AC/GkGi8jIO+txpAUz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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