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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1a6a7b6ef80d28d174ae4a0ec12c4ac17fc8c20ac288cc6dc1c685e1e5c5bec' 
  AND token = 'dtS+4hYOsbN0el+yF7S2tnfwoNRrriyMakNliXWVQyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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