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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3ad4383c6fd16d1aee792b645f7be6549632c5f50b91664015935bbac087811' 
  AND token = 'OsDzI9eSfxQOnKmzpEmGn54Tu+S0vjxU1w1Q4Q2WfG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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