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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '070d842430bc76b6280330fcb3864d885e0da8e82927299e9d21eb3944d32fc4' 
  AND token = 'x3a7W7HL4jr3TzNSPPoyWpwn2RqSVqMbPy3GcBI8l+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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