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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e6a9ca1d3147468b59005d5e385020f6dce719acd6893cb23ff51a2925be8e8' 
  AND token = 'WIm1I65wsxn+1DGV6F6NwSIdE6Y1qoaL00WkanGt0mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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