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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0605020133243a214af51478f785056ac88c336456102ba3425c1a594ef1eda5' 
  AND token = 'm5FPEaa5gBtyNdy58TUkP00GYOgM/PkgCc11uIvh9TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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