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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2830d1f996cd9f024e5eeb1e1bfe48816bd4514b796c2a0f03af329742a0a26d' 
  AND token = 'LtMU4RQ6jHUtYLR0/B0s/VimY8AyIyizTAy/WkjU9Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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