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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dcba01105e102d149e3a286716b87d941f12f9421d68df9265e186500ce0749f' 
  AND token = 'MGkH7SQLm5mriMb46q5UPMXEeH2lAJKUr+fcRis1KU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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