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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0bfd7373d82f7acdb7ddb6a2ee46c23b1123cb38bf2f0b476dcd3513cb92e09' 
  AND token = 'V53nDYvWOSiuaArA7mFXhzb5U1IbcA4OHc9WAmpnzNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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