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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ffa4093a75262adefdb8b6ba450390344cca5bb2dd9f4ccbd7f2bc3e054f4ed' 
  AND token = 'I7QJWS9k0nnTY9f9ZGDYlXcq+S28cCFJXp95/rW8PvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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