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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e06db54e269b7e46d11e0139fea13833d3229eb3cb0b5ef81146fe468695c2f1' 
  AND token = '3A125ZVTc7ndrdCSuV9Z32I7rt4wHW4XGyzvto9bovU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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