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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20fd65a2bb406a620b23121a2945ea0ce93866a3f0edd5e5e651a2c8ae749958' 
  AND token = 'eObQHGgAIJUl26bDU2ISv7TypnVBcuQVkgb/HDmCDF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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