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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e189950f90dd35ae36982cd0fb03b24524a466db05ef2f401190cf9bed167ced' 
  AND token = '/N5aoRQMRQfNwxt9DrlrsROt2gUezE97uKQA9NdZUng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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