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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b29e7180ac8aeb4dd2e65069ba8845cc0fd575661ff0287e490faf3d9bec1d73' 
  AND token = 'zbKmvZlQvUPV7FEt4oF9jaumow4scd1br7UH98OK6Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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