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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e92f627ae255f129784058339d95c6dfac5da8967622aaca54512ed0e9ef7ec' 
  AND token = 'zzx5zvnwW+3YNcX15TOoMfCj5dKAxvx4/5w6Hny3YdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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