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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f129576edb241581debd8366a1e98e5e16d39990798dfb8337ce409907468e0' 
  AND token = 'GTst/24yLuzX8DBIemGA6f2q928IfBMoVoHprrktUTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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