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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20d421448a0508f11cf085c03aac68070b997fbe6989389dc6a39cd369e82a8a' 
  AND token = 'MoJU95s/qCAdNDvp+5/N6cRg1oFlgYAAu4nTIqgSd7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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