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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc3faacb4391ca9fc3d5f1bd141a76dec07d36774079726cad16ea895e5a836d' 
  AND token = 'Tw5kAaJF8vBrpNjXGHxtpK4Xf7ZdjfSJguafp9PIik4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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