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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbfe9563cea88bf9219ee89cb4c51b9d9d2ea7565b0014dc80c7cd4be07fe235' 
  AND token = 'X0sdIBgzxC9crL547nPoENisP0S7xt3GqLm/QNlyQXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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