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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e7f4e0264b7930c0049e711616ac91afd44ee2e584a197150a6271dbb5258ef' 
  AND token = 'kXDNUVBf+5pxOuNYin2LICter1O0oa5078irjCNPqsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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