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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5e687acab3af4bad85a38489101ed4e368a9674a82b283a07761b7a0c9ec553' 
  AND token = 'yaWvG/CBCxke+tFBEYFOYUvX7elze/WsNepA3bxpBAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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