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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bda3b96aa33789bb546f8d0708863dcdef979d9a96818b3251e6795bbcb04c79' 
  AND token = 'WHsdSsOJJ9vN8eMK/7Z9kVT0d1VYVCArntVzoPhZ588=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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