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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a34a556e98996d83d19877b5ce69e0abb4be71f1a7489322ef7302330400b6fd' 
  AND token = 'Nt6IAsQCAUanOquMgDjNUCJitLPx7N5ebQzIKz27NxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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