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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8a9c584796ed03afb79cceaff72f051aa12cde2030b0bb786da0e58e3645429' 
  AND token = 'JPMv4OaiODXnhSXOTeYD7MtNKFD4hZkMuMW74GSS3QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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