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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7bac35c17d44bacf95ff3d737dcc3be85e94ba539389470d68b9b8edf9810430' 
  AND token = 'Meohtl8K8KM0hmI2/MfLi2ktcb/WrJ6friDF2gksj1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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