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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '983dc62a090949ce1cc6fdc108b672a206cd902281835da696bb8520b0e64a19' 
  AND token = '4TkqDt3NxJNiWFFrSlAjrHOfC9NgQ8HgSKNt80NurGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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