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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb55ae2439a7c1820342da2b17f5079c018a6cc987fcef95fe71013bbbf28e83' 
  AND token = 'l8z99ruW6hD6TAbk2azW65h/n/L11JpmqlEK6idrkPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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