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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71262957439029e4803c74c5abbc8888ca319e68a98e2d496b5ce0b533267155' 
  AND token = 'Z7D0E2fK6ngize+25NP6l0ZFAOpSM/vA9bX4xUG5s08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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