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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'efd3d9d28ac4222098f311a234bede9084a6bd57e436ad6de1307279b6d074d3' 
  AND token = 'vYg8W89qLS2gILEYJI9PNnhu57sdOU+AHRYvWGiMHsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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