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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4afbc509a7f46f71681992a945acec6949b399bbbd191f966557b3c55c68da1' 
  AND token = 'bvOmBTO1+iMClz5bebojE/cl6fnQ7chMM4mfctHule0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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