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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b39968560e5f7d711fc60393e601f2345c746bf93c8d0db110360c696f74936a' 
  AND token = 'xzPTpGbPtQ7gfxA4tIpORvx8yHouaK2sUBLejBb02UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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